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As suggested by paulus we can simplify the Data Stream Control Register
(DSCR) Facility Status and Control Register (FSCR) handling.
Firstly, we simplify the asm by using a rldimi.
Secondly, we now use the FSCR only to control the DSCR facility, rather
than both the FSCR and HFSCR. Users will see no functional change from
this but will get a minor speedup as they will trap into the kernel only
once (rather than twice) when they first touch the DSCR. Also, this
changes removes a bunch of ugly FTR_SECTION code.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
bc683a7e51